The transport coefficients can be computed straightforwardly with the above
models for diffuse and ballistic transport. Rezende et al.
[1]} and Cornelissen et al. [2]} formulated
a Boltzmann equation in the relaxation time approximation, where the latter
focusses on the role of the magnon chemical potential. Flebus et
al.'s [3]} spin Seebeck effect theory for magnon polarons can be
easily adapted to handle ferrons. Meier and Loss' [4]} scattering
theory for magnon transport in ballistic spin chains inspired our ferron
transport formulation [5]}
